Malicious PDF — malware analysis report

Static analysis result for SHA-256 723e123351746ade…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 07:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: deb6ae89214830ffea66fb8cef17de08 SHA-1: dbe903b1000ef967f2e4f3803566176d45a7ea33 SHA-256: 723e123351746adee0a4e62b7ecd172c726d14717fbc1940a85909d9d6167bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://portalpr-b2b.es/img/user///file/_0937020001628230731.pdf In PDF document text
    • https://kp-bs.ru/upload/files/pimuxigazanoranok.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/ritad.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/favan.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608574bd22b0e---97316554802.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/52769d5fb719b5692f8b11567d0aa369/7433674528.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hkovg0gkvpejs7i8vifpe9l2b0/fifutijiliwodekowipuj.pdfIn PDF document text
    • https://htchninc.com/d/files/xosofovu.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/85291571477.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/51747095494.pdfIn PDF document text
    • http://gumberryoleschool.com/clients/33891/File/kivodixuto.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607501dd7eb31---41926976147.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/84502322527.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/79309013495.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610d58aa0d---sosasebanowodove.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/66530367646.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/5394386560.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/74950829360.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/togokosug.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ac39a2cb---rugazomafir.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210609061512_8buy86.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ab02163b---28511110366.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0115db4fe3---wozijinebu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf4fe3b04---kivovovovab.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/zeraxojofar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=disguise+and+mistaken+identity+in+twelfth+night+pdfPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/nekogasikuborafe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 19540 bytes
SHA-256: 24fb748965ce1d257689e6c25846a63c46b6c7ab62c4997eefd7b8db7f3ca261
font_01_sfnt_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 11120 bytes
SHA-256: 397881ad413c501999eba56b091e7d72adaa7f1f8dd15fc0f0c0457c6e67aa45
font_02_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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